"You never know that one little small thing that you think is not important could be important to us," said Danielle. "That's my child, that's my daughter, that's my baby. There will never be a point that I stop searching for her."

In what could be a new development, detectives are now saying they believe Tyarra disappeared after she visited her friend and was apparently on her way home -- a small detail that could help solve the mystery of the missing teen.

"What I'm hoping for is to come across a neighbor or someone from the neighborhood that has seen her, knows something, a possible clue," said Danielle Williams.

A $2,000 reward is being offered for solid tips about Tyarra Williams.